[FEATURE REQUEST] Add a progress bar for uploads about photoprism-mobile

[xarantolus]

Hi, I'm currently looking into this issue.
One problem I faced is that the progress listener function seems to not be called by the flutter_uploader package, at least on Android 11. I changed to code to the following, but still there's no output from any of the functions:

uploader.progress.listen(
  (UploadTaskProgress progress) {
    photoprismModel.addLogEntry(
        'AutoUploaderProgress', progress.progress.toString());
  },
  onError: (Object ex, StackTrace stacktrace) {
    photoprismModel.addLogEntry('AutoUploaderProgressError', ex.toString());
  },
  onDone: () {
    photoprismModel.addLogEntry('AutoUploaderProgressDone', 'done');
  },
  cancelOnError: false,
);

Does anyone have an idea what the root cause could be?
I already tried setting the flutter_uploader version to 1.2.1 to see if the problem also happens on a non-beta version, but that version is quite old and doesn't seem to support newer flutter versions.